Flow and Turbulence Structure Around an In-Stream Rectangular Cylinder with Scour Hole

dc.contributor.authorKirkil, Gökhan
dc.contributor.authorConstantinescu, George
dc.date.accessioned2019-06-27T08:03:56Z
dc.date.available2019-06-27T08:03:56Z
dc.date.issued2013
dc.departmentFakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Endüstri Mühendisliği Bölümüen_US
dc.description.abstractAn eddy resolving technique is used to reveal the unsteady dynamics of the coherent structures present in the flow field around an in-stream vertical cylinder with a scour hole at a channel Reynolds number of 240000. Such an investigation is important as most of the erosion around obstacles present in alluvial streams takes place after a scour hole of sufficiently large dimensions to stabilize the large-scale oscillations of the horseshoe vortex (HV) system has formed. The cylinder has a rectangular section and is placed perpendicular to the incoming flow. The geometry of the scour hole is obtained from an experiment. The mechanisms driving the bed erosion during the advanced stages of the scour process around the vertical plate are discussed. Simulation results demonstrate the critical role played by these large-scale turbulent eddies and their interactions in driving the local scour. Results show that important changes in the structure of the wake (e. g. the wake loses its undular shape due to suppression of the anti-symmetrical shedding of the roller vortices) and the nature of the interactions between the necklaces vortices of the HV system and the eddies present inside the detached shear layers (DSLs) occurs as the scour process proceeds. This means that information on the vortical structure of the flow at the initiation of the scour process or during its initial stages are insufficient to understand the local scour mechanisms.en_US]
dc.identifier.citation0
dc.identifier.endpage4712
dc.identifier.isbn978-7-302-33544-3
dc.identifier.scopusqualityN/A
dc.identifier.startpage4704en_US
dc.identifier.urihttps://hdl.handle.net/20.500.12469/866
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2010WR009336
dc.identifier.wosWOS:000343761507002en_US
dc.identifier.wosqualityN/A
dc.institutionauthorKirkil, Gökhanen_US
dc.language.isoenen_US
dc.publisherTSINGHUA UNIVen_US
dc.relation.journalProceedings Of The 35th Iahr World Congress, Vols I and IIen_US
dc.relation.publicationcategoryKonferans Öğesi - Uluslararası - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectBridge scouren_US
dc.subjectEddy resolving techniquesen_US
dc.subjectDetached eddy simulationen_US
dc.subjectRectangular piersen_US
dc.subjectExperimentsen_US
dc.titleFlow and Turbulence Structure Around an In-Stream Rectangular Cylinder with Scour Holeen_US
dc.typeConference Objecten_US
dspace.entity.typePublication
relation.isAuthorOfPublicationc777ed76-9b8f-43f2-a3b0-0222883181af
relation.isAuthorOfPublication.latestForDiscoveryc777ed76-9b8f-43f2-a3b0-0222883181af

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